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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '720844e349e0bb2ee02db8413d7a56215c1da5e9b9311d36ecc4a7c3759393bd' 
  AND token = 'apnk5UBfhtpswfcPyiikhOkGumc8dVVKYj/WPu8PwNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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