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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108d6e1cf8ed9b6da8f0ec04232bfe8764f1996f1b3b20f64077c0cb65c1165d' 
  AND token = '4byYGGIcaOdjkEOBSvUnqeGYT2l2jWehd30t8z4Q4dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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