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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f44fa1ecffa711611026c877cbd0d031dc23df925a371823ea2f918f4a522c6' 
  AND token = 'd0k2tGPeriiNNLh+Qf2dKEupGMSthsVbU9uKEhX85Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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