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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc2e8f7c91255c9aca8b7b802934776a86a64a780e7070a1c777408b304a3ba' 
  AND token = '5spIAZ9MrwKiPJeySxXe8/SwQ+20V/oYxBPioDUisaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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