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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414e4a6d4872ee249873bae75c77ae416ae58f2094a4f07bf892e83eedc35e34' 
  AND token = '2Gg9Drn3dZw9nCc3t/HUPhV4TW/1blipsoeCcvoVJzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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