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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf80c92fd6b2d430bd86095e643ce13137e37a3af792c0001d8e1a9f4f317c0' 
  AND token = 'BMCJq81j3J1acKu7M0Y7CABUE3KW8gXoVXQoKO3jX1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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