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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a2406744ccc77f32c51d72ec8050dcc927adee30eb609199c2537f709f010c' 
  AND token = '0oS0Qby0sQ9TNFofeGxFpzZlClQNM6gAkJ1dgNHeo3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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