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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e23363e72e03422f64ba9cc839aa47cdee34f1459da3ebcd71a6b67d467cfd' 
  AND token = 'd9DbC9Zv7a9Zjsb8t4TgLdd3Lc7jqyVH6G4R+iW5Fh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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