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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0d33002e5297d50db8e447d51a23670c8dc9ef324805b79d8d3d4ff05c2807' 
  AND token = 'dANqsdEEj/MZ+P3QieIE0ItVOFRnFrcab3oiM5FpYxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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