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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47058ee3375dfa6f9658522613cde905d943f94cdf8507c0a405566a1dce638c' 
  AND token = 'InIESaEHc8j2MbwQ+5gYwWguMRYiwHAPfhIkRabNJfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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