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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ec1ad3f9d6ee2138209537137ae12d835712bfbb590999b70f6e45c8d43364' 
  AND token = '8nWer1D/PFq5isIMi3LH/kUf5ZjTnk3dVwmM0LLIz9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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