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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8139412c3a5263ffc86d0066837d46ce1a44fe8c24817c83b0460356d4422636' 
  AND token = 'kuTMBwWZR+ZpEbIyJOU18sakKE/vITqWOcO3/Gqj4D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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