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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dff90eed301ff0b7bba1c0d23ffbd2328839060f6caa4a124f145ea68f93123' 
  AND token = '4OM52DKTQ4EETBQ7AfWXFm5WdGRQcIZA6aPH46dbZC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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