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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503d062d8d720c2f79a8e1d85324a585bd1028742791c3edce766cf83c60143f' 
  AND token = 'dMxZKAXUxBQ8mNHzj5Ymt7j7xkIqFjOdaFdxkGLfTRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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