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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f976453cee38c5a706f9a64caa2387cb062eaf2bbf41c7fe1317cf566a3d0f9' 
  AND token = 'hpncpiu2WAB8mRzciMIJ1TdsJ52umxL7FBq7nTyHvzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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