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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '106e1793aad3c5295d12f442d1bf0caa92c0624e0bc11b3959e0ec400bf9ac09' 
  AND token = 'qNttcc3Ir5WGQJocpCL5S6lHS1JglG3K+PQnD4AI8/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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