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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ad5509435d7cc29f69a88fc0cc4f3016fcb2da44479b5addbe5ed8c14e3e7f' 
  AND token = 'NzMIjHN9+geDi/RZKmMqaCwJJJL6aerNXDL09DHtz6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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