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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3200b3661ca2e6d472ded0cdbcef8d053eccf3ac585b0aec4cd3d18f056f7540' 
  AND token = 'WZ07PE7jXP8B6IFAoahATv0AFKNPFR0nw9Fpxlux60o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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