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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a1ed1d0a78b96d0a14c0d42619c885b07bca044324804e73e55fc6c2b64a05' 
  AND token = 'aHEu93FybSfLigLe4Ae/3augba7JCprb8yxPO4Uduyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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