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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a13a8823b40186ff2ada8556e874ea485ab903240b400efb78e5b420dabf69' 
  AND token = 'kSbp8afj1SactNq/bxxUFBT1XwmcQle2IzujtMUu+Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}