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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ceec362b11c26249c7fd23e449b758d3732170ce3bb82fe0c4ca381374b139' 
  AND token = 'I7BUe94kp9aw+aGAxd0LvyIP+1RtdbTBIiw/9mdDhKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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