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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c42fea77748486a2f04a0c3abfce1b12b024f2bead7338d717b5ed40ae03ba' 
  AND token = '7C5YnlswkS6VZM6Sl2Se9TL+hDwHb1S66uZAyJnOOuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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