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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c62e758660cdd1ec90af00760fbb0c3baecc0cec041dc1560df72dd8bbdcb48' 
  AND token = '3yUzG5SCOZHoD6rt21ryVSCP4VCOZxgKPfIrDltIwfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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