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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e0027c857b6b71ae56b99a2bcdc43907e3fe1b1aa9496c1d82f74355b458fc' 
  AND token = '4ZhGa+KFPPJrEN8kWyG5X9aJhWToQfZxBaw/j6in5h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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