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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae93c9d53624606299b2cdbcc3c2340cae45fd988dfb81da7c025441deead49' 
  AND token = 'x5Ja9Wf/BnSmZUw5Ns2bfsvCVebDIANFccpi3wk3mtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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