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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04887365e97c1ee9a3dafd23fc218f4408dae32816797859d3f4f4f945ba1459' 
  AND token = 'GHA2nRLCDYEDc102hWjWiv2foak2VvD1lA31qJXRouU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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