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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56854c0210b0c12ec2203237975914f9c526ab63b70d2cbed0eba9841c88218e' 
  AND token = 'wdVOsi1I/RAYFzemeB4AsupRvB4IrvIGKo267roe3tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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