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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f84541f531dbc8c9a395945e2f032ec039a2aec3961b7885190223cc8364d7a' 
  AND token = 'FuO6WioRxB2VbrjArl2dK8W0cC6K+doGF7Gw6fcN4CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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