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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e05a973ef3acb9dad23435497852521d0662f287b0c73ce2fb214a3d00b3a6b' 
  AND token = 'bFr/M7YDVkZqQmilTLQNIcf8rvI/eb2M2cT8EvzZOb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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