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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701493582236d0c52996fa2835818191ebb2cd594a6fbb1fcadadb1b0acbc331' 
  AND token = '0lAYidFXuBgMuvZmDclb9KJmbp0MBesmDVHqOB137pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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