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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19246846876cab77ae9527dfa3f7e824dbece7433cd996c8a5b6372ad23eee9a' 
  AND token = '+wOb85arxuYRj3UGZ+MnLB+NVd66VG+Jv+oo/3V6pt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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