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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc438838edd1a93f9bb89c1c879fa44051af9d827e9c99a8bd5ac6516dc1c58' 
  AND token = 'mthZRx7Tfa9H0GquMWeJLwM8O6VTziZ1etHG/Ku22GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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