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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6301a33a0ef7e0530c566cfd786439f4392144cf5fec83c9942d7d65db9749d9' 
  AND token = '1pIawTQEJ530n5SMzoBmtzQ721NW1VqgV7Xy7WHPGBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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