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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff3f6ffab7ba27dc4588fad690ba452f19f391f2397d91386182f4317d2a2d4' 
  AND token = 'sQdNHP4/TjiKSn5Y81mrlOe3o95neH5qQNTqalXB7vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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