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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab4e4f73ddb90c0f71635a21a8a5e26b7578607b8ccbea39aa9b45cb9c775e4' 
  AND token = 'lVrfVquVkE8QtENI1q1R8NXxrfQUhUtEcZ21+H6y7ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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