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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ebab8bd0f298b91441c1044ef345477bc2d7cba2c77352bffd52008388723c' 
  AND token = 'ImHKn74qL2YYsbgB5sDgxtEUUcTRc2hmr0/leC6G3fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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