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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfee7411b2f505df9d7e03a2edff4fc2eabc0f01792112518218aa6c7eb772f5' 
  AND token = 'f5NbUPMKn4Dz6RiGfOzEbOXqsZiqlOF17h5fwpbvvIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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