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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8beec7b26b59bf2ec7f4372714c49109f6547ab8a14aa5edaf04a660d62f381' 
  AND token = 'LRovwC8aaue/fXdKuym6cbBJ+fjKrMpDlytY50+t1Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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