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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed1c8b482d3de8e2dae4b6c39d67332107f8f78c5079601c1b20ebc8760a458' 
  AND token = '058u9Is9oj7oGfeBWG+LIm2hbQlP7TOlxML4PC4UBQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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