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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31271657fa1ff01c47fd0fcd07f6fd6945e7491442a1b19a17f79d5c0cf459ba' 
  AND token = 'vZnDFFzUpH0a1bEd0TRGSt0DuEZhKgURR9fbYiR2DeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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