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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1db5d6db80ef79fb1d4ff08d409ad0e22049a6aacb540d99696ef6d2b6fbbff' 
  AND token = 'aY0VQR90FySXTz2VO+s7fmsAGWteB9TYoolkgrRJZ+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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