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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ca7f69c715df57746d35fd5f6ea64c7cca45fefa22932a6d3e038c7970b74b' 
  AND token = 'wQzdxVkXgAuwhZHCGypon3DwEI41dq6GXWgufQ9SfOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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