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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a88fd57c8c3b51d7e39e9a1695a144fb88e6c43e70eb08f025ae0d95e695ad' 
  AND token = '/R7nOfWkYCTkB9dQ8zNpoaQTslPHn4V6iBnbzaLuVZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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