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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c30a9c47c508d92735d0e7220030e0c7907ec6bcdcfcffb6da2cc0db173c7d' 
  AND token = 'ReihgIY9zo2m1sipm5DJT2IGmZgqnyx/SX7wKhm0dqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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