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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '221943a41ab23e18f5ad3893a2c975a91920be46f5b886ca5f850090606b9d82' 
  AND token = 'TX+MWnh8ZY330mHIyyoLvYWt3ZNcdx6YvvxVn66Tm54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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