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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fd4eab492bf7bef96bb0726c1058cbb7623723fe3aa7804d75387bf61bc76c' 
  AND token = 'pk7KcxVX6NCd+nY8JOneUcpSgC3Hpj8a1jA/UqcXOCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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