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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137d9df92e0e220f0ec716d81345eb721b71a06f172a7e992485e74dce4a3245' 
  AND token = 'YCpZG5537rPqs+q839xQt18pZhR8vdGZ2TTMvDoeoQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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