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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af9bbc72f9b182e118dca2c5689110e945c8d7e0869a7562c38262100d2496c' 
  AND token = 'AjSWdj7HX/D2W5aC1vAt2oX87ZR9/1jOP0MDaedPIMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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