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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b931806be96b570edb6c1caba4a109595770229e58cd8b551a909d294a8fb3' 
  AND token = 'd88whgNoxPu9dvy0QVPpH3DVUR/SftIYYRMQQX3oxcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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