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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037a811b2888988452a901b274cdad91d2dec41b144df19c4fb5a5a1054218e9' 
  AND token = 'oD1ZFNQBjHf/XcE9axOf22rS3BcT3096pita/pJx9x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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