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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b789a77be7e9ed9568d712ef5ff46120dabffbe558a50c485c9dacda0b5ae7' 
  AND token = 'd02ifBiZHy3qJdFCeiPO04g/c3NigDg1Yy1kAgYDVGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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