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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275c4117811473d84fe7df92f135a13e92c2b0d5932c4edd00470235720a4739' 
  AND token = '0z3U4lPT26L2YrKRFFuwqcCdJZaZfQggHuDVrCjPHQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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