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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd14e37beadff3ad3b364d55ccd4e5f1890ddba4667351c6e439fcc7cdb3b36' 
  AND token = 'YLY+hOtnU81iY61EqvkzOMP7kFWFhRJXECj2AIOREY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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