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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5792314c67076604df890b312f5039f8111e8050b7ef8ac034b9199854e60e2' 
  AND token = 'rhChZ+QJgaNIzCQ5nln/i0vCtI0d78SV2OH9/l7G0mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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