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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e21d6d5f9568c067ba1723ddac6adb4a29564810f1eea81f2556d68c7d05ad2d' 
  AND token = 'cy0AZ1If+nOjn6VVVCHCOciNNpOFj46Oomeb6kNn2Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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