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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44432cf70e5dd4ddf9663833ee9808c98aa1276a891bcf491d2aa0136eefb684' 
  AND token = 'eq3zKIyxCE2vfjNqa2OmQHmLZb2N0kCGY5VuRInQrrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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