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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e7c22bc28001c803dacd6a47d4530d0ac0212829e719c4afe83210b5c1c54b' 
  AND token = 'NoATgT9H/VXXJ3ZdxIMwTofy5MR6jES1cwjtE1jEeaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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