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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5955f07a715667eb39165cec74ae970738ca5b2ba2c7ed853d3a4d8d38565b20' 
  AND token = '8WLUlkwQWjBbsNSnRQ6qTfj6vBhrKmrTXFu6NBXjuFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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