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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c3b533ca6dc2fee1ee20d9540c6513eb4b32f49108ad6402fbff2d7dff6c5a' 
  AND token = 'yDBFEVHeQw4mdbTBMMo8APSkOqNvrvFTariHR3URAXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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