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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e1fc2bfcc37b0750f66ea9405f8bbc6e98b61999252fc6e88b1a61d7da458c' 
  AND token = '32Cy236pOOVNUbSJ2/d6NyJ8qS/tMW41LQtMPyq+HwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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