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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec51430e240e1ede5d6478bd6878cc2533be8bd2a8f9c8b1151cd043b089798e' 
  AND token = '+THSlRtVnh9Yl5KASjT5SUYHIp0GwJctZS/BcH1e2K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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