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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c705959d6b6c5716457f619f6cc712b14e6290f62cad2e0b23c0a6914a1e2c' 
  AND token = '8hm/hvwjBJVBXkX1EcHn0kUm6PCl0koYDpEK6+22MEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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