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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669a8f93e5b1d4ed7b048818ebece4f8347c4a3bb395bf9cc70b50531af817f0' 
  AND token = 'HW5yYCfXScdCaE0u+saciHEyxCUv4vgV5YniNerYsUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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